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|a (TOE)ost516994
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|a (TOE)516994
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|a TOE
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|a E 1.99:CONF-970909--4
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|a E 1.99:CONF-970909--4
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|a CONF-970909--4
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|a DE97008243
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|a Stability of ultrafine lamellar structures during aging in two-phase γ-TiAl alloys
|h [electronic resource]
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|a Washington, D.C. :
|b United States. Dept. of Energy ;
|a Oak Ridge, Tenn. :
|b distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
|c 1997.
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|a 15 p.
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| 336 |
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|a text
|b txt
|2 rdacontent.
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|a computer
|b c
|2 rdamedia.
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| 338 |
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|a online resource
|b cr
|2 rdacarrier.
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|a Published through the Information Bridge: DOE Scientific and Technical Information.
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|a 08/01/1997.
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|a "CONF-970909--4"
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|a "DE97008243"
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|a 2. international symposium on structural intermetallics, Champion, PA (United States), 21-26 Sep 1997.
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| 500 |
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|a Wright, J.L.; Liu, C.T.; Maziasz, P.J.
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| 520 |
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|a Two-phase γ-tail alloys such as PM Ti-47Al-2Cr-2Nb or Ti-47Al- 2Cr-1Nb-Ta hot extruded above the α-transus temperature have unique refined-colony/ultrafine lamellar structures. These lamellar microstructures consist of very fine laths of the γ and α₂ phases, with average interlamellar spacings of 100 nm and α₂-α₂ spacings of 200 nm, and are dominated by γ/α₂ interfaces. This ultrafine lamellar structure remains stable during 900 C heat treatment for 2 h, but becomes unstable after 4 h at 982 C. This structure remains stable in both alloys after aging for >5000 h at 800 C but disappears completely at 1000 C. Continuous coarsening begins with dissolution of fine α₂ lamellea. The aged Ta-modified alloy shows similar lamellar coarsening behavior within the colonies but has more discontinuous coarsening of the intercolony γ with new precipitation of coarse α₂ and β phase particles. Analytical electron microscopy show that changes in α₂ phase composition correlate with microstructural instability.
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| 536 |
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|b AC05-96OR22464.
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| 650 |
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7 |
|a Titanium Alloys.
|2 local.
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| 650 |
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7 |
|a Aging.
|2 local.
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| 650 |
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7 |
|a Microstructure.
|2 local.
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| 650 |
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7 |
|a Aluminium Alloys.
|2 local.
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| 650 |
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|a Chromium Alloys.
|2 local.
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| 650 |
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|a Niobium Alloys.
|2 local.
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| 650 |
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|a Phase Studies.
|2 local.
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| 650 |
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|a Stability.
|2 local.
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| 650 |
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|a Tantalum Additions.
|2 local.
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| 650 |
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|a Materials Science.
|2 edbsc.
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| 710 |
2 |
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|a Oak Ridge National Laboratory.
|b .
|4 res.
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| 710 |
2 |
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|a United States.
|b Department of Energy.
|4 spn.
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| 710 |
2 |
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|a United States.
|b Department of Energy.
|b Office of Scientific and Technical Information.
|4 dst.
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| 856 |
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|u http://www.osti.gov/servlets/purl/516994-oVbc5c/webviewable/
|z Online Access
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| 907 |
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|a .b56408109
|b 03-06-23
|c 12-16-09
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| 998 |
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|a web
|b 12-16-09
|c f
|d m
|e p
|f eng
|g dcu
|h 0
|i 1
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| 956 |
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|a Information bridge
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|i 73e79573-2deb-55e8-baf1-dd89e2269b04
|s 4e693907-99df-546b-a2e5-f08be45ab36d
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| 952 |
f |
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|p Can circulate
|a University of Colorado Boulder
|b Online
|c Online
|d Online
|e E 1.99:CONF-970909--4
|h Superintendent of Documents classification
|i web
|n 1
|
